JP2612086B2 - Screw head of injection molding machine - Google Patents
Screw head of injection molding machineInfo
- Publication number
- JP2612086B2 JP2612086B2 JP2141591A JP14159190A JP2612086B2 JP 2612086 B2 JP2612086 B2 JP 2612086B2 JP 2141591 A JP2141591 A JP 2141591A JP 14159190 A JP14159190 A JP 14159190A JP 2612086 B2 JP2612086 B2 JP 2612086B2
- Authority
- JP
- Japan
- Prior art keywords
- screw
- neck
- injection molding
- molding machine
- screw head
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 238000001746 injection moulding Methods 0.000 title claims description 14
- 238000010438 heat treatment Methods 0.000 claims description 13
- 239000011347 resin Substances 0.000 description 21
- 229920005989 resin Polymers 0.000 description 21
- 230000008018 melting Effects 0.000 description 6
- 238000002844 melting Methods 0.000 description 6
- 238000002347 injection Methods 0.000 description 3
- 239000007924 injection Substances 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 2
- 238000005303 weighing Methods 0.000 description 2
- 230000007423 decrease Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000012778 molding material Substances 0.000 description 1
- 210000003625 skull Anatomy 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/46—Means for plasticising or homogenising the moulding material or forcing it into the mould
- B29C45/47—Means for plasticising or homogenising the moulding material or forcing it into the mould using screws
- B29C45/50—Axially movable screw
- B29C45/52—Non-return devices
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
Description
【発明の詳細な説明】 （産業上の利用分野） 本発明は、射出成形機のスクリュヘッドに関するもの
である。Description: TECHNICAL FIELD The present invention relates to a screw head for an injection molding machine.
（従来の技術） 従来、加熱シリンダ内で加熱され流動化された成形材
料を高圧により金型内に射出し、その中で冷却固化又は
硬化させ、次いで金型を開いて成形品を取り出すように
した射出成形機においては、加熱シリンダの中にスクリ
ュが回転及び進退自在に配設され、該スクリュによって
溶融した樹脂が射出されるようになっている。(Prior Art) Conventionally, a molding material heated and fluidized in a heating cylinder is injected into a mold under high pressure, cooled and solidified or cured therein, and then the mold is opened to remove a molded product. In the injection molding machine described above, a screw is arranged in a heating cylinder so as to rotate and move forward and backward, and the molten resin is injected by the screw.
そのため、スクリュの先端には溶融樹脂を押し出すた
めのスクリュヘッドが設けられ、スクリュに内ねじ止め
によって取り付けられている。Therefore, a screw head for extruding the molten resin is provided at the tip of the screw, and is attached to the screw by internal screwing.
第３図は従来の射出成形機のスクリュヘッド部分の断
面図である。FIG. 3 is a sectional view of a screw head portion of a conventional injection molding machine.
図において、１はスクリュヘッド、２は樹脂の逆流を
防止するための逆止リング、３は該逆止リング２が後退
した時に当接するシールリング、４はスクリュ、５は加
熱シリンダ、６は溶融した樹脂である。In the drawing, 1 is a screw head, 2 is a check ring for preventing backflow of resin, 3 is a seal ring that abuts when the check ring 2 is retracted, 4 is a screw, 5 is a heating cylinder, and 6 is a melting cylinder. It is a resin.
スクリュ４が前進して金型内に樹脂を充填すると、続
いて次のショットに先駆けて、樹脂６を溶融し可塑化し
てスクリュヘッド１の先端に蓄える作業、すなわち計量
が行われる。該計量においては、スクリュ４が図示しな
い駆動系に駆動されて後退し、この時、ホッパすなわち
材料供給口から落下供給された樹脂６が、上記スクリュ
４の回転により溝4aの中を前方に移動しつつ加熱シリン
ダ５内で溶融し、スクリュ４の前方に蓄えられる。溶融
に伴い発生する加熱シリンダ５内の樹脂６の圧力は、ス
クリュ４に対する反力となり、該反力でスクリュ４が後
退するようになっている。When the screw 4 moves forward and the resin is filled in the mold, the operation of melting and plasticizing the resin 6 and storing it at the tip of the screw head 1 before the next shot is performed, that is, weighing is performed. In the measurement, the screw 4 is driven by a drive system (not shown) and retreats. At this time, the resin 6 dropped and supplied from the hopper, that is, the material supply port, moves forward in the groove 4a by the rotation of the screw 4. While being melted in the heating cylinder 5, it is stored in front of the screw 4. The pressure of the resin 6 in the heating cylinder 5 generated by the melting becomes a reaction force to the screw 4, and the screw 4 retreats by the reaction force.
こうして、スクリュ４の前方に蓄えられた樹脂６は、
続いて該スクリュ４を駆動系によって前方に押し出すこ
とにより図示しないノズルから金型の中に射出される。Thus, the resin 6 stored in front of the screw 4 is
Subsequently, the screw 4 is pushed forward by a drive system to be injected into a mold from a nozzle (not shown).
ここで、上記樹脂６は、金型内に射出される際に加え
られる射出力の反力によって、その一部が上記スクリュ
４の溝4aを伝わって後方に逆流する。これを防止するた
め、逆止リング２がスクリュ４の前端に配設されてい
る。そして、該逆止リング２がスクリュ４から抜けない
ように、スクリュ４と別体のスクリュヘッド１を形成
し、上記スクリュ４に雌ネジ4bが形成され、スクリュヘ
ッド１の後端には雄ネジ1aが形成され両者がネジ止めさ
れる。そして、スクリュヘッド１の外径を上記逆止リン
グ２の内径より大きくして、逆止リング２が抜けないよ
うにしている。Here, a part of the resin 6 flows backward through the groove 4a of the screw 4 due to the reaction force of the injection force applied when the resin 6 is injected into the mold. In order to prevent this, a check ring 2 is arranged at the front end of the screw 4. A screw head 1 is formed separately from the screw 4 so that the check ring 2 does not come off from the screw 4. A female screw 4 b is formed on the screw 4, and a male screw is provided at the rear end of the screw head 1. 1a is formed and both are screwed. The outer diameter of the screw head 1 is made larger than the inner diameter of the check ring 2 so that the check ring 2 does not come off.
ところで、上記構成の射出成形機のスクリュヘッド１
には、射出の際に3000気圧に相当する圧力が、計量の際
にスクリュ回転に伴いねじりトルクが、サックバックの
際に引張り力がそれぞれ作用する。このため、スクリュ
ヘッド１の取付ねじ部、あるいはねじ首部が破損するこ
とがある。By the way, the screw head 1 of the injection molding machine having the above configuration
At the time of injection, a pressure equivalent to 3000 atm is applied, a torsional torque is applied with the rotation of the screw at the time of measurement, and a tensile force is applied at the time of suckback. For this reason, the mounting screw portion or the screw neck portion of the screw head 1 may be damaged.
そこで、スクリュヘッド１の強度を高めるために、ね
じ山をテーパ状にしたもの、ねじ首部をくびれ形にした
ものが提供されている（住友重機械技報Vol.32 No.95,p
7−10,August 1984参照）。Therefore, in order to increase the strength of the screw head 1, a screw head having a tapered shape and a screw neck having a constricted shape are provided (Sumitomo Heavy Industries Technical Report Vol.32 No.95, p.
7-10, August 1984).
（発明が解決しようとする課題） しかしながら、上記構成の射出成形機のスクリュヘッ
ドにおいてねじ山をテーパ状にしたねじを使用したもの
は、標準のねじを使用したものに比べて疲労強度は向上
するが、ねじ首部をくびれ形にしたねじを使用したもの
程ではない。一方、ねじ首部をくびれ形にしたねじを使
用した場合には疲労強度は増すが、ねじりに弱くなる。(Problems to be Solved by the Invention) However, in the screw head of the injection molding machine having the above-described configuration, a screw head having a tapered thread is improved in fatigue strength as compared with a screw head using a standard screw. However, the use of a screw with a necked screw neck is not as great. On the other hand, when a screw having a constricted screw neck is used, the fatigue strength increases, but the screw is weak against torsion.
すなわち、ねじ首部を細くすることによりねじ首部で
の変形が容易になって疲労強度が向上し、ねじ部の応力
振幅が小さくなるが、その反面、ねじりトルク、引張り
応力に対しては弱くなってしまう。In other words, by making the screw neck thinner, deformation at the screw neck becomes easier and fatigue strength improves, and the stress amplitude of the screw part becomes smaller, but on the other hand, it becomes weaker against torsional torque and tensile stress. I will.
本発明は、上記従来の射出成形機のスクルヘッドの問
題点を解決して、スクリュヘッドの疲労強度を向上し、
ねじ部の応力振幅を小さくするとともに、ねじりトル
ク、引張り応力に対しても強く、ねじ部又はねじ首部の
破損を防止することができる射出成形機のスクリュヘッ
ドを提供することを目的とする。The present invention solves the problems of the skull head of the conventional injection molding machine described above, improves the fatigue strength of the screw head,
An object of the present invention is to provide a screw head of an injection molding machine that can reduce the stress amplitude of a screw portion, is strong against torsional torque and tensile stress, and can prevent breakage of a screw portion or a screw neck portion.
（課題を解決するための手段） そのために、本発明の射出成形機のスクリュヘッドに
おいては、加熱シリンダのノズル側に形成される円錐部
と、該円錐部の後方に形成され、周囲に逆止リングを配
設した小径部と、該小径部の後方に形成されるねじ首部
と、該ねじ首部の後方に形成されるねじ部を有してお
り、上記ねじ首部及びねじ部の中央に、軸方向に延びる
穴を形成している。(Means for Solving the Problems) For this purpose, in the screw head of the injection molding machine of the present invention, a conical portion formed on the nozzle side of the heating cylinder, and a conical portion formed behind the conical portion and having a non-return around the periphery It has a small diameter portion provided with a ring, a screw neck portion formed behind the small diameter portion, and a screw portion formed behind the screw neck portion, and a shaft is provided at the center of the screw neck portion and the screw portion. A hole extending in the direction is formed.
（作用） 本発明によれば、上記のように加熱シリンダのノズル
側に形成される円錐部と、該円錐部の後方に形成され、
周囲に逆止リングを配設した小径部と、該小径部の後方
に形成されるねじ首部と、該ねじ首部の後方に形成され
るねじ部を有しており、上記ねじ首部及びねじ部の中央
に、軸方向に延びる穴を形成している。(Operation) According to the present invention, as described above, a conical portion formed on the nozzle side of the heating cylinder, and a conical portion formed behind the conical portion,
It has a small-diameter portion around which a check ring is disposed, a screw neck formed behind the small-diameter portion, and a screw portion formed behind the screw neck. An axially extending hole is formed at the center.
したがって、ねじ首部が薄肉となるため変形が容易に
なってねじ部の応力振幅を小さくするとともに、穴を軸
方向に形成しただけねじ首部の外径が大きくなる。Therefore, since the screw neck is thin, deformation is facilitated and the stress amplitude of the screw is reduced, and the outer diameter of the screw neck is increased by forming the hole in the axial direction.
（実施例） 以下、本発明の実施例について図面を参照しながら詳
細に説明する。(Example) Hereinafter, an example of the present invention will be described in detail with reference to the drawings.
第１図は本発明の射出成形機のスクリュヘッドの断面
図である。FIG. 1 is a sectional view of a screw head of an injection molding machine according to the present invention.
図において、１はスクリュヘッド、２は樹脂の逆流を
防止するための逆止リング、３は該逆止リング２が後退
した時に当接するシールリング、４はスクリュ、５は加
熱シリンダ、６は溶融した樹脂である。In the drawing, 1 is a screw head, 2 is a check ring for preventing backflow of resin, 3 is a seal ring that abuts when the check ring 2 is retracted, 4 is a screw, 5 is a heating cylinder, and 6 is a melting cylinder. It is a resin.
スクリュ４が前進して金型内に樹脂を充填すると、続
いて次のショットに先駆けて、樹脂６を溶融し可塑化し
てスクリュヘッド１の先端に蓄える作業、すなわち計量
が行われる。該計量においては、スクリュ４が図示しな
い駆動系に駆動されて後退し、この時、ホッパすなわち
材料供給口から落下供給された樹脂６が、上記スクリュ
４の回転により溝4aの中を前方に移動しつつ加熱シリン
ダ５内で溶融し、スクリュ４の前端に蓄えられる。溶融
に伴い発生する加熱シリンダ５内の樹脂６の圧力は、ス
クリュ４に対する反力となり、該反力でスクリュ４が後
退するようになっている。When the screw 4 moves forward and the resin is filled in the mold, the operation of melting and plasticizing the resin 6 and storing it at the tip of the screw head 1 before the next shot is performed, that is, weighing is performed. In the measurement, the screw 4 is driven by a drive system (not shown) and retreats. At this time, the resin 6 dropped and supplied from the hopper, that is, the material supply port, moves forward in the groove 4a by the rotation of the screw 4. While being melted in the heating cylinder 5, it is stored at the front end of the screw 4. The pressure of the resin 6 in the heating cylinder 5 generated by the melting becomes a reaction force to the screw 4, and the screw 4 retreats by the reaction force.
こうして、スクリュ４の前端部に蓄えられた樹脂６
は、続いて該スクリュ４を駆動系によって前方に押し出
すことにより図示しないノズルから金型の中に射出され
る。Thus, the resin 6 stored at the front end of the screw 4
Then, by pushing the screw 4 forward by a drive system, the screw 4 is injected into a mold from a nozzle (not shown).
ここで、上記樹脂６は、金型内に射出される際に加え
られる射出力の反力によって、その一部が上記スクリュ
４の溝4aを伝わって後方に逆流する。これを防止するた
め、逆止リング２がスクリュ４の前端に配設されてい
る。そして、該逆止リング２がスクリュ４から抜けない
ように、スクリュ４と別体のスクリュヘッド１を形成
し、上記スクリュ４に雌ネジ4bを形成する一方、スクリ
ュヘッド１の後端に雄ネジ1aを形成して両者をネジ止め
するようにしている。Here, a part of the resin 6 flows backward through the groove 4a of the screw 4 due to the reaction force of the injection force applied when the resin 6 is injected into the mold. In order to prevent this, a check ring 2 is arranged at the front end of the screw 4. A screw head 1 is formed separately from the screw 4 so that the check ring 2 does not come off from the screw 4, and a female screw 4 b is formed on the screw 4, while a male screw is formed on the rear end of the screw head 1. 1a is formed and both are screwed.
そして、スクリュヘッド１は、ノズル側の先端に形成
される円錐部1b、該円錐部1bに隣接し、周囲に逆止リン
グ２が配設される小径部1c、該小径部1cに続くねじ首部
1d、該ねじ首部1dに隣接するとともに外周にねじが形成
されるねじ部1eで形成されており、上記円錐部1bの外径
を上記逆止リング２の内径より大きくし、小径部1cの外
径を逆止リング２の内径より小さくして、逆止リング２
が抜けないようにしている。The screw head 1 has a conical portion 1b formed at the tip on the nozzle side, a small-diameter portion 1c adjacent to the conical portion 1b, around which a check ring 2 is disposed, and a screw neck portion following the small-diameter portion 1c.
1d, a threaded portion 1e adjacent to the threaded neck portion 1d and formed with a screw on the outer periphery, the outer diameter of the conical portion 1b is made larger than the inner diameter of the check ring 2, and the outer diameter of the small-diameter portion 1c Make the diameter smaller than the inner diameter of the check ring 2
Is kept from falling out.
また、上記スクリュヘッド１の中央には、ねじ首部1d
及びねじ部1e間に及ぶ穴11が軸方向に形成されている。
その結果、上記ねじ首部1d及びねじ部1eは環状の断面を
有することになる。そして、該環状断面の断面積を従来
のスクリュヘッド１のねじ首部の断面積と同一とするこ
とにより、ねじ首部1d及びねじ部1eの圧縮強度を従来の
ものと同じにすることができ、またねじ首部の変形も容
易であり疲労強度を同じにすることができる。In the center of the screw head 1, a screw neck 1d
And a hole 11 extending between the screw portions 1e is formed in the axial direction.
As a result, the screw neck 1d and the screw 1e have an annular cross section. By making the cross-sectional area of the annular cross section the same as the cross-sectional area of the screw neck portion of the conventional screw head 1, the compressive strength of the screw neck portion 1d and the screw portion 1e can be made the same as the conventional one. The deformation of the screw neck is easy and the fatigue strength can be made the same.
一方、ねじりトルクに対しては、ねじ首部1dに作用す
る応力τは、 T:ねじりトルク d:ねじ首部1dの外径 a:ねじ首部1dの穴11の径 C:応力集中係数 である。On the other hand, for torsional torque, the stress τ acting on the screw neck 1d is T: Torsion torque d: Outer diameter of screw neck 1d a: Diameter of hole 11 of screw neck 1d C: Stress concentration factor
上式から、ねじ首部1dの外径ｄを大きくすると応力が
低下することが分かる。From the above equation, it can be seen that the stress decreases as the outer diameter d of the screw neck 1d increases.
第２図はねじ首部に作用する応力の試算結果を示す図
である。FIG. 2 is a diagram showing a result of a trial calculation of stress acting on the screw neck.
図に示すように、ねじ首部1dの外径ｄが大きいほど、
ねじ首部1dの穴11の径ａが小さいほど、ねじりによる変
形量が小さくなることが分かる。As shown in the figure, as the outer diameter d of the screw neck 1d is larger,
It can be seen that the smaller the diameter a of the hole 11 in the screw neck 1d, the smaller the amount of deformation due to torsion.
引張り力については通常の使用状態、すなわちサック
バック時において問題となるレベルに達していないの
で、現状と同一の強さを有していればよい。Since the tensile force does not reach a problematic level in a normal use state, that is, at the time of suckback, it is sufficient that the tensile force is the same as the current state.
なお、本発明は上記実施例に限定されるものではな
く、本発明の趣旨に基づいて種々の変形が可能であり、
これらを本発明の範囲から排除するものではない。It should be noted that the present invention is not limited to the above embodiment, and various modifications are possible based on the gist of the present invention.
They are not excluded from the scope of the present invention.
（発明の効果） 以上、詳細に説明したように本発明によれば、加熱シ
リンダのノズル側に形成される円錐部と、該円錐部の後
方に形成され、周囲に逆止リングを配設した小径部と、
該小径部の後方に形成されるねじ首部と、該ねじ首部の
後方に形成されるねじ部を有しており、上記ねじ首部及
びねじ部の中央に、軸方向に延びる穴を形成している。(Effects of the Invention) As described in detail above, according to the present invention, a conical portion formed on the nozzle side of the heating cylinder, and a check ring formed around the conical portion and disposed around the conical portion are provided. A small diameter part,
It has a screw neck formed behind the small diameter part and a screw part formed behind the screw neck, and has a hole extending in the axial direction at the center of the screw neck and the screw part. .
したがって、ねじ首部が薄肉となるため変形が容易に
なってねじ部の応力振幅を小さくするとともに、ねじ首
部の外径が大きくなるため、ねじりトルクに対して強く
なる。Therefore, since the screw neck is thin, deformation is facilitated and the stress amplitude of the screw is reduced, and the outer diameter of the screw neck is increased, thereby increasing the torsional torque.
第１図は本発明の射出成形機のスクリュヘッドの断面
図、第２図はねじ首部に作用する応力の試算結果を示す
図、第３図は従来の射出成形機のスクリュヘッドの断面
図である。 １……スクリュヘッド、1b……円錐部、1c……小径部、
1d……ねじ首部、1e……ねじ部、２……逆止リング、３
……シールリング、４……スクリュ、4a……溝、５……
加熱シリンダ、６……樹脂、11……穴。FIG. 1 is a sectional view of a screw head of an injection molding machine according to the present invention, FIG. 2 is a view showing a calculation result of stress acting on a screw neck, and FIG. 3 is a sectional view of a screw head of a conventional injection molding machine. is there. 1 screw head, 1b cone part, 1c small diameter part
1d ... screw neck, 1e ... screw, 2 ... check ring, 3
…… Seal ring, 4… Screw, 4a… Groove, 5…
Heating cylinder, 6 ... resin, 11 ... holes.
Claims (1)
機のスクリュヘッドにおいて、 （ａ）加熱シリンダのノズル側に形成される円錐部と、 （ｂ）該円錐部の後方に形成され、周囲に逆止リングを
配設した小径部と、 （ｃ）該小径部の後方に形成されるねじ首部と、 （ｄ）該ねじ首部の後方に形成されるねじ部を有してお
り、 （ｅ）上記ねじ首部及びねじ部の中央に、軸方向に延び
る穴を形成したことを特徴とする射出成形機のスクリュ
ヘッド。1. A screw head of an injection molding machine attached to a tip of a screw, comprising: (a) a conical portion formed on a nozzle side of a heating cylinder; and (b) a conical portion formed behind the conical portion and inverted to the periphery. A small diameter portion provided with a retaining ring, (c) a screw neck portion formed behind the small diameter portion, and (d) a screw portion formed behind the screw neck portion. A screw head for an injection molding machine, wherein a hole extending in the axial direction is formed at the center of the screw neck and the screw.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2141591A JP2612086B2 (en) | 1990-06-01 | 1990-06-01 | Screw head of injection molding machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2141591A JP2612086B2 (en) | 1990-06-01 | 1990-06-01 | Screw head of injection molding machine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0437515A JPH0437515A (en) | 1992-02-07 |
| JP2612086B2 true JP2612086B2 (en) | 1997-05-21 |
Family
ID=15295571
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2141591A Expired - Lifetime JP2612086B2 (en) | 1990-06-01 | 1990-06-01 | Screw head of injection molding machine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2612086B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA2143244C (en) * | 1994-02-24 | 1999-04-20 | Mikiyoshi Miyauchi | Screw head for injection molding machine |
-
1990
- 1990-06-01 JP JP2141591A patent/JP2612086B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0437515A (en) | 1992-02-07 |
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